Climatronic Control Module A/C Control Head Electrical Component Testing
Climatronic Control Module A/C Control Head Electrical Component Testing
=> [ Heated Rear Window, Testing ]
=> [ Heated Seats, Checking ]
=> [ Heated Windshield, Checking Activation ]
Heated Rear Window, Testing
• If there is a condition which does not allow activation of rear window heating (short circuit in the connection to the rear window or to the rear window defogger relay (J9), open circuit in the voltage supply to the Climatronic control module (J255) A/C control head, or an open Cabrio convertible top), the indicator lamp in the button illuminates when the button in the Climatronic control module (J255) A/C control head is pressed and goes back out when released again but the heater is not activated
• If the voltage measured by the Climatronic control module (J255) A/C control head at terminal "30" is less than 12.5 V, the heated rear window output is reduced and the load on the generator is relieved (the electronics of the Climatronic control module (J255) A/C control head reduces the duty cycle of the activation from 100% to 90....10%).
• In the case of vehicles up to VIN "399999" of model year 2005 (in the Sedan and Avant) and "012912" of model year 2005 (Cabrio), the heated rear window ( Z1) is directly controlled by the Climatronic control module (J255) A/C control head (the relay that connects the current is installed in the Climatronic control module (J255) A/C control head)
• In the case of vehicles up to VIN "400000" of model year 2005 (in the Sedan and Avant) and "012913" of model year 2005 (Cabrio), the heated rear window ( Z1) is no longer directly controlled by the Climatronic control module (J255) A/C control head (a relay is not installed in the Climatronic control module (J255) A/C control head with a part number from index "AJ"). In these vehicles the heated rear window (Z1) is controlled via the rear window defogger relay (J9).
• The heated rear window stays switched on at outside temperatures up to 0°C until ignition is switched off (heated rear window can be switched manually at anytime). If the temperature becomes greater than 0°C during a driving period, switch-off of the heated rear window ( Z1) occurs after the operating time stored in the Climatronic control module (J255) A/C control head has elapsed (approximately 12 minutes).
• Activation of the heated rear window (Z1) is automatically switched off at ambient temperatures greater than 0°C after expiration of the operating time (approx. 12 minutes) stored in the Climatronic control module (J255) A/C control head by the Climatronic control module (J255) A/C control head.
• Vehicle Diagnosis, Testing and Information System ( VAS 5051A) (with inductive pickup 50 A (VAS 5051/9 ))
• Connector test set (V.A.G 1594C)
• All fuses OK
- Switch the ignition off.
- Remove the Climatronic control module (J255) A/C control head.
- Pull connectors - D - and - F - out of the Climatronic control module (J255) A/C control head.
- Connect the adapter cable (V.A.G 1598/12 ) of the test box to disconnected connector - D -.
- Connect the test box (V.A.G 1598A) to the adapter cable (V.A.G 1598/12)
Test in vehicles up to VIN "399999" of model year 2005 (in the Sedan and Avant) and "012912" of model year 2005 (Cabrio).
- Measure the voltage between contact "5" at connector - F - and jack "13" (ground connection) of the test box.
• Specification: Approx. battery voltage
- Measure the resistance between contact 6 at connector - F - and jack "13" (ground connection) of the test box.
• Target value: Resistance approx. 0.5.....1.0 ohms (ohms)
• Since resistances less than 10 ohms cannot be measured with sufficient exactness using workshop tools, a short circuit in the wire connection or the heated rear window (Z1) cannot be determined.
• If the resistance is too great, check the wire connections to the heated rear window (Z1) for open circuit and introduce corrective measures..
- Connect connectors - D - and - F - to the Climatronic control module (J255) A/C control head (all connectors are now connected to the Climatronic control module (J255) A/C control head).
- Conduct the wiring to connector - F - terminal " 6" through inductive pickup 50 A (VAS 5051/9 ).
- Set the "multimeter: current 50A inductive pickup" operating mode in the Vehicle Diagnosis, Testing and Information System (VAS 5051A).
• All connections on the Climatronic control module ( J255) A/C control head must be attached.
- Start the engine.
- Switch on the heated rear window on the Climatronic control module (J255) A/C control head (the indicator lamp in the button illuminates).
• Target value: The display changes from approx. 0 A to less than 25 A
- Wait approx. 12 minutes.
• Target value: The display changes from less than 25 A to approx. 0 A (the indicator lamp in the button goes out)
• A low current can be displayed when the heated rear window is off as a result of incident radiation in relation to the inductive pickup.
• The heated rear window (Z1) stays switched on at outside temperatures less than 0°C until the ignition is switched off (heated rear window can be switched off manually at anytime). If the temperature becomes greater than 0°C during a driving period, the heated rear window shuts off after the operating time stored in the Climatronic control module (J255) A/C control head has elapsed (approximately 12 minutes).
• With outside temperatures greater than 0 °C the heated rear window is switched off automatically by A/C control head Climatronic Control Module (J255) after the programmed operating time (approximately 12 minutes) in A/C control head Climatronic Control Module (J255) has elapsed.
Test in vehicles starting with VIN "400000" of model year 2005 (in the Sedan and Avant) and "0129123" of model year 2005 (Cabrio).
- Measure the voltage between jack "12" (terminal " 30") and jack "13" (ground connection) of the test box.
• Target value: Approx. battery voltage
- Measure the resistance between contact "6" at connector - F - and jack "13" (ground connection) of the test box.
• Target value: Resistance approx. 10....100 ohms (ohms)
• Since resistances less than 10 ohms cannot be measured with sufficient exactness using workshop tools, a short circuit in the wire connection or the heated rear window (Z1) cannot be determined.
• If the resistance is too great, check the wire connections to the heated rear window (Z1) for open circuit and introduce corrective measures.
- Connect connectors - D - and - F - to the Climatronic control module (J255) A/C control head (all connectors are now connected to the Climatronic control module (J255) A/C control head).
- Set the "multimeter, voltage measurement (20 V =)" operating mode in the Vehicle Diagnosis, Testing and Information System (VAS 5051A).
• All connections on the Climatronic control module ( J255) A/C control head must be attached.
• Measure the voltage between contact "6" at connector - F - and jack "13" (ground connection) of the test box.
• Target value: Voltage less than 2 V
- Start the engine.
- Switch on the heated rear window on the Climatronic control module (J255) A/C control head (the indicator lamp in the button illuminates).
• Target value: The voltage changes from approx. 0 V to approx. battery voltage (and the rear window defogger relay (J9) switches the heated rear window (Z1) on. )
• To check the activation of the rear window defogger, you can, for example, place a hand on the area of the rear window with the heating wires; the heating wires must become warm.
- Wait approx. 12 minutes.
• Target value: The display changes from approx. battery voltage to less than 2 V (the indicator lamp in the button goes out)
• The heated rear window (Z1) stays switched on at outside temperatures less than 0°C until the ignition is switched off (heated rear window can be switched off manually at anytime). If the temperature becomes greater than 0°C during a driving period, the heated rear window shuts off after the operating time stored in the Climatronic control module (J255) A/C control head has elapsed (approximately 12 minutes).
• With outside temperatures greater than 0 °C the heated rear window is switched off automatically by A/C control head Climatronic Control Module (J255) after the programmed operating time (approximately 12 minutes) in A/C control head Climatronic Control Module (J255) has elapsed.
Heated Seats, Checking
• If the voltage measured by the Climatronic control module (J255) A/C control head at terminal "30" is less than 12.3 V, the heated rear window output is reduced and the load on the generator is relieved (the electronics of the Climatronic control module (J255) A/C control head reduces the duty cycle of the activation from 100% to 90....10%).
Heated Seat Temperature Sensor, Checking
Special tools, testers and auxiliary items required
• Test box (V.A.G 1598A) and associated adapter cable (V.A.G 1598/11) and adapter cable (V.A.G 1598/12)
• Vehicle Diagnostic, Testing and Information System ( VAS 5051A) with multimeter leads (VAS 5051/7)
• Connector test set (V.A.G 1594C)
- Switch the ignition off.
- Remove the Climatronic control module (J255) A/C control head.
- Connect the test box (V.A.G 1598A) with the related adapter cable (V.A.G 1598/11) to connector - C -=> [ Wires and Components, Testing ] Wires and Components, Testing.
- Connect the adapter cable (V.A.G 1598/12 ) to connector - D - (use a second test box (V.A.G 1598A) or connect the measuring device via a suitable measuring lead from the connector test kit (V.A.G 1594C) directly to the adapter cable (V.A.G 1598/12 )) => [ Wires and Components, Testing ] Wires and Components, Testing.
• The contact assignment of connector - C - in the adapter cable (V.A.G 1598/11) and connector - D - in the adapter cable (V.A.G 1598/12) is identical to the jack assignment at the test box ( V.A.G 1598A).
- Measure the resistance between contact "5" in connector - C - (to the heated driver seat temperature sensor (G59)) and contact "16" in connector - D - (ground connection) at the test boxes.
• Target value: Resistance greater than 1.5 kohms (kilo-ohms) and less than 25 kohms (depending on the temperature of the temperature sensor, the measured value is approx. 10 kohms at a seat temperature of 20°C)
- Measure the resistance between contact "6" in connector - C - (to the heated passenger seat temperature sensor (G60)) and contact "16" in connector - D - (ground connection) at the test boxes.
• Target value: Resistance greater than 1.5 kohms (kilo-ohms) and less than 25 kohms (depending on the temperature of the temperature sensor, the measured value is approx. 10 kohms at a seat temperature of 20°C)
• In vehicles with steering on the right, the heated driver seat temperature sensor (G59) is connected to contact " 6" and the heated passenger seat temperature sensor (G60) is connected to contact "5".
• The resistance value of the temperature sensor in the heating elements of the seats changes with the temperature (the specifications in the following table are approximate values).
• If the resistance is too great, check the wire connections to the heating elements of the heated seats for open circuit or contact resistance and introduce corrective measures. If the open circuit is in the seat, repair the seat.
Heated Seat Heating Elements, Checking
Special tools, testers and auxiliary items required
• Vehicle Diagnosis, Testing and Information System ( VAS 5051A) (with inductive pickup 50 A (VAS 5051/9 ))
• Connector test set (V.A.G 1594C)
• Test box (V.A.G 1598A) and the adapter cable (V.A.G 1598/12)
• All fuses OK.
- Switch the ignition off.
- Remove the Climatronic control module (J255) A/C control head.
- Pull connectors - D - and - F - out of the Climatronic control module (J255) A/C control head.
- Connect the adapter cable (V.A.G 1598/12 ) of the test box to disconnected connector - D -.
- Connect the test box (V.A.G 1598A) to the adapter cable (V.A.G 1598/12)
- Measure the voltage between contact "3" at connector - F - and jack "13" (ground connection) of the test box (V.A.G 1598A).
• Target value: Approx. battery voltage
- Measure the resistance between contact "1" at connector - F - (to the driver seat heating element (Z6)) and jack "13" (ground connection) of the test box (V.A.G 1598A).
• Target value: Resistance approx. 1.5 (.....2.5) to 25 ohms (ohms)
- Measure the resistance between contact "2" at connector - F - (to the passenger seat heating element) and jack "13" (ground connection) of the test box (V.A.G 1598A).
• Target value: Resistance approx. 1.5 (.....2.5) to 25 ohms (ohms)
• As a result of the contact resistances at the various connectors, resistance values of up to approx. 25 ohms can be measured. As soon as a voltage of 12 V is applied, these contact resistances decrease and do not affect the function of the seat heater.
• In vehicles with steering on the right, the driver seat is connected to contact "2" and the passenger seat is connected to contact " 1".
• The resistance value of the seat heating elements changes with the temperature (at a seat temperature of 20°C, the resistance value is approx. 1.9 ohms).
• Since resistances less than 10 ohms cannot be measured with sufficient exactness using workshop tools, a short circuit in the wire connection or the seat heating elements cannot be determined.
• If the resistance is too great, check the wire connections to the heating elements of the heated seats for open circuit and introduce corrective measures. If the open circuit is in the seat, repair the seat.
- Connect connectors - D - and - F - to the Climatronic control module (J255) A/C control head (all connectors are now connected to the Climatronic control module (J255) A/C control head).
- Conduct the wiring to connector - F - terminal " 1" (terminal "2" in vehicles with steering on the right) through the inductive pickup 50 A (VAS 5051/9).
- Set the "multimeter: current 50A inductive pickup" operating mode in the Vehicle Diagnosis, Testing and Information System (VAS 5051A).
- Set both thumb wheels for heated seats (on the Climatronic control module (J255) A/C control head) to position " 0".
• All connections on the Climatronic control module ( J255) A/C control head must be attached.
- Start the engine.
- Set the thumb wheel for the driver seat heating element to position " 6".
• Target value: The display changes from approx. 0 A to less than 10 A
- Set the thumb wheel for the driver seat heating element to position " 0".
• Target value: The display changes from less than 10 A to approx. 0 A
- Conduct the wiring to connector - F - terminal " 2" (terminal "1" in vehicles with steering on the right) through the inductive pickup 50 A (VAS 5051/9).
- Set the thumb wheel for the passenger seat heating element to position " 6".
• Target value: The display changes from approx. 0 A to less than 10 A
- Set the thumb wheel for the passenger seat heating element to position " 0".
• Target value: The display changes from less than 10 A to approx. 0 A
• A low current can be displayed when the seat heater is off as a result of incident radiation in relation to the inductive pickup.
• If there is an open circuit or short circuit in the connection to the temperature sensor in the seat, the output to the heating element is not connected by the Climatronic control module (J255) A/C control head.
• If there is a short circuit to ground in the seat heating element or in the wire connection, the Climatronic control module ( J255) A/C control head does not activate the heater (as soon as an excessive current is present, a shutoff operation is performed immediately).
• The design of the heating elements in the seats varies. Depending on the version of the heating elements, it is therefore possible for both seat bolsters to be continuously heated in the case of an open circuit in the heating element of the seat cushion (the temperature sensor is located in the seat cushion).
Heated Windshield, Checking Activation
Special tools, testers and auxiliary items required
• Test box (V.A.G 1598A) and associated adapter cable (V.A.G 1598/11) and adapter cable (V.A.G 1598/12)
• Vehicle Diagnosis, Testing and Information System ( VAS 5051A) (with the multimeter leads (VAS 5051/7 ))
• Connector test set (V.A.G 1594C)
- Switch the ignition off.
- Remove the Climatronic control module (J255) A/C control head.
- Connect the test box (V.A.G 1598A) via the associated adapter cable (V.A.G 1598/11) between connector - C - and the Climatronic control module (J255) A/C control head. Refer to => [ Wires and Components, Testing ] Wires and Components, Testing.
- Connect the adapter cable (V.A.G 1598/12 ) between connector - D - and the Climatronic control module (J255) A/C control head (use a second test box (V.A.G 1598A) or connect the measuring device via a suitable measuring lead from the connector test kit ( V.A.G 1594C) directly to the adapter cable (V.A.G 1598/12 )). Refer to => [ Wires and Components, Testing ] Wires and Components, Testing.
• The contact assignment of connector - C - in the adapter cable (V.A.G 1598/11) and connector - D - in the adapter cable (V.A.G 1598/12) is identical to the jack assignment at the test box ( V.A.G 1598A).
- Start the engine.
• All connections on the Climatronic control module ( J255) A/C control head must be attached.
- Measure the voltage between contact "8" in connector - C - (to the heated windshield control module (J505 )) and contact "16" in connector - D - (ground connection).
• Target value: Approx. battery voltage
• If a voltage is measured as less than 5 V, the heated windshield control module (J505) is currently not ready to activate heating of the windshield or there is a short circuit to ground in the connection to the heated windshield control module (J505). Refer to => [ Heated Windshield Function ] Heated Windshield.
• If a voltage between 5 V and 8 V is measured, the Climatronic control module (J255) A/C control head activates the heated windshield control module (J505) which activates heating of the windshield.